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DC (ST/SG) 134121/5© UCLES 2017 [Turn over

PHYSICS 0625/52Paper 5 Practical Test October/November 2017 1 hour 15 minutesCandidates answer on the Question Paper.Additional Materials: As listed in the Confidential Instructions.

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name in the spaces at the top of the page.Write in dark blue or black pen.You may use an HB pencil for any diagrams, graphs or rough working.Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.

Answer all questions.You are advised to spend about 20 minutes on each of questions 1 to 3, and about 15 minutes on question 4.Electronic calculators may be used.You may lose marks if you do not show your working or if you do not use appropriate units.

At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ ] at the end of each question or part question.

The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.

Cambridge International ExaminationsCambridge International General Certificate of Secondary Education

For Examiner’s Use

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1 In this experiment, you will compare the oscillations of two pendulums. Carry out the following instructions, referring to Figs. 1.1 and 1.2.

clamp

d

bob

clamp

one completeoscillation

Fig. 1.1 Fig. 1.2

A pendulum has been set up for you as shown in Fig. 1.1. This pendulum has a spherical pendulum bob.

(a) Adjust the pendulum until the distance d measured to the bottom of the bob is 50.0 cm.

Explain briefly how to use the set-square to avoid a parallax (line of sight) error when measuring the distance d. You may draw a diagram.

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(b) Move the bob slightly to the side and release it so that it swings. Fig. 1.2 shows one complete oscillation of the pendulum.

(i) Measure the time t1 for 20 complete oscillations.

t1 = ...........................................................[1]

(ii) Calculate the period T1 of the pendulum. The period is the time for one complete oscillation.

T1 = ...........................................................[2]

(c) Remove the pendulum from the clamp and attach the second pendulum provided to the clamp. This has a long, thin bob. Adjust the pendulum until the distance d measured to the bottom of the bob is 50.0 cm.

Displace the bob slightly and release it so that it swings.

(i) Measure the time t2 for 20 complete oscillations.

t2 = ...........................................................[1]

(ii) Calculate the period T2 of the pendulum.

T2 = ...........................................................[1]

(d) A student suggests that the periods T1 and T2 should be equal.

State whether your results support this suggestion. Justify your answer by reference to the results.

statement ..................................................................................................................................

justification ................................................................................................................................

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(e) The period T of a pendulum can be determined by measuring the time t for 20 complete oscillations and then calculating the period. Some students are asked to explain the reason for this method being more accurate than measuring the time taken for one oscillation.

Tick the box next to the sentence that gives the best explanation.

The method eliminates errors from the measurements.

The method is more accurate because the experiment is repeated.

The method includes more readings so there is less chance for errors.

The method reduces the effect of errors when starting and stopping the stopwatch.[1]

(f) A student plans to carry out more pendulum experiments. He considers possible variables, and precautions to improve accuracy.

In the following list, mark the possible variables with the letter V and the precautions with the letter P.

amplitude of swing

length of pendulum

mass of pendulum bob

shape of pendulum bob

use of a reference point to aid counting

viewing the rule at right angles when measuring the length[2]

[Total: 11]

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2 In this experiment, you will investigate the cooling of water.

(a) Measure room temperature θR.

θR = ...........................................................[1]

(b) • Pour 50 cm3 of the hot water provided into beaker A.

• Measure the temperature θH of the water in beaker A.

θH = ...............................................................

• Add 50 cm3 of the cold water provided to the hot water in beaker A. Stir the water briefly.

• Measure the temperature θM of the water in beaker A.

θM = ...............................................................

• Calculate the temperature fall θF using the equation θF = θH − θM.

θF = ...............................................................

• Empty beaker A. [3]

(c) Suggest one reason for stirring the water before reading θM.

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(d) Repeat the procedure in (b) using 75 cm3 of hot water and 75 cm3 of cold water.

θH = ...............................................................

θM = ...............................................................

θF = ...............................................................[1]

(e) Repeat the procedure in (b) using 100 cm3 of hot water and 100 cm3 of cold water.

θH = ...............................................................

θM = ...............................................................

θF = ...............................................................[1]

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(f) Measure room temperature θR again.

θR = ...............................................................

Complete the appropriate sentence.

• Room temperature has remained constant at ............... .

• Room temperature has decreased by ............... .

• Room temperature has increased by ............... .[1]

(g) A student states that the temperature fall θF should be the same each time because the proportions of hot and cold water are the same.

Suggest a reason why θF could be very different in (b), (d) and (e).

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(h) Suggest an improvement to the apparatus to make it more likely that θF would be the same each time.

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(i) Suggest a condition, not included in your answer to (h), that could be controlled to make it more likely that θF would be the same each time.

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[Total: 11]

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3 In this experiment, you will determine the focal length f of a lens.

Carry out the following instructions referring to Fig. 3.1.

illuminatedobject

u

lens

screen

bench

v

Fig. 3.1

(a) (i) Place the screen 100 cm from the illuminated object.

• Place the lens between the object and the screen so that the centre of the lens is at a distance u = 20.0 cm from the object.

• Adjust the position of the screen until a clearly focused image is formed on the screen.

• Measure the distance v between the centre of the lens and the screen. Record the values of u and v in Table 3.1.

Table 3.1

u / cm v / cm

(ii) Repeat the procedure using values for u of 22.0 cm, 25.0 cm, 30.0 cm and 35.0 cm. [3]

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(b) Plot a graph of v / cm (y-axis) against u / cm (x-axis). You do not need to start your axes at the origin (0, 0). Draw the best-fit curve.

[4]

(c) (i) • Mark, with a cross, the point on the graph grid where u = 25.0 cm and v = 25.0 cm.

• Mark, with a cross, the point on the graph grid where u = 35.0 cm and v = 35.0 cm.

• Join these two points with a straight line. [1]

(ii) • Record u1, the value of u at the point where the straight line crosses your graph line.

u1 = ..........................................................cm

• Record v1, the value of v at the point where the straight line crosses your graph line.

v1 = ..........................................................cm[1]

(iii) Calculate the focal length f of the lens using the equation f = (u1 + v1)

4 .

f = ..........................................................cm [2]

[Total: 11]

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4 A student has a selection of rubber bands of different thicknesses. He is investigating the amount of stretch produced by different loads. Fig. 4.1 shows the set-up used.

clamp

rubber band

benchhook

stand

boss

Fig. 4.1

In addition to the apparatus shown in Fig. 4.1, the following apparatus is available to the student:

metre rule selection of different rubber bands selection of loads.

Plan an experiment to investigate how rubber bands of different thicknesses stretch when loaded.

You are not required to carry out this experiment.

You should

• explain briefly how you would carry out the investigation

• state the key variables that you would control

• draw a table, or tables, with column headings to show how you would display your readings (You are not required to enter any readings in the table.)

• explain briefly how you would use your readings to reach a conclusion.

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[Total: 7]

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